The controversial trick emission measurements carried out by Volkswagen in million vehicles went unnoticed for years until a group of researchers from the University of West Virginia (USA) and the International Council the Clean Transportation (ICCT) found fraud.
The research began in 2013 as part of a project “to assess emissions” in real operating circumstances for light diesel vehicles in the United States.
The tests performed
To do this, the researchers conducted emission testing in three vehicles. Volkswagen Jetta, Volkswagen Passat and BMW X5
The researchers said that in The tests, which were performed on five different routes with driving characteristics, from urban to rural, emissions of nitrogen oxide Jetta were between 15 and 35 times higher than the limits set by the Environmental Protection Agency (EPA) .S.
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With regard to the Passat, emissions were between 5 and 20 times higher, while in the case of the BMW model, emissions were within EPA parameters.
However, emissions of Volkswagen vehicles when the car was stationary were at the limits of the regulations.
The information obtained by investigators on discrepancies was sent in 2014 to US authorities, both the EPA and the Environmental Protection Agency of California, who started their own investigations.
According to the researchers, the only answer to these discrepancies is the software that is today installed in all vehicles to control the operation of their engines.
VW. How trick VW measurements
The software detect when the vehicle is being tested to determine their emissions and trigger a cycle of the engine that reduces emissions of nitrogen oxide, a gas that is responsible for smoke and pollution in cities.
Researchers do not know if the software detects a lack of movement of the steering wheel or the system disconnect traction control, two circumstances that occur when vehicles are tested stationary emissions.
No details
Volkswagen not It has been revealed yet how tweaking software that allows emissions works.
Volkswagen AG shares fell on Wednesday for a third day as the automaker struggled to contain the growing scandal over match-fixing tests on vehicle emissions.
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Actions
The share price fell 4% to 101.75 euros in early trade on Wednesday Frankfurt. The drop follows declines of 17% and 20% in the first two days of the week.
VW said Tuesday that 11 million of its vehicles worldwide contain software that can evade testing emissions, well above the 482,000 cars identified by US authorities in their analysis of violations of clean air laws.
The executive director of the firm, Martin Winterkorn, said it “deeply regrets” the case and asked in a video message “your confidence going.” The future of the steering remains shrouded in questions.
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